Unable to read Digital output (DO) from a robot Controller with a PLC (DL205)

[latendal]

Hi guys,

I've hit a major road block developing a machine. I can't seem to read Digital output signals from a robot controller (Fanuc RJ2 controller, pheripheral interface CRM2A) at my PLC (DL205) even though when i monitor Digital outputs at the robot controller it indicates they are being sent out. I've triple checked my wiring and it looks fine (see attachment for wiring details). The funny thing is that i can send DI (Digital Input) signals to the robot successfully. I've tried everything i can possibly think of with no success and any help will be greatly appreciated!!

Noteworthy: I am using the sourcing config for wiring and here is a link for my PLC input http://www.automationdirect.com/static/manuals/d2user/ch2.pdf - page 31

 

[bernie_carlton]

Please state which input module you are using in the DL205 rack.

What do you measure using a voltmeter (ON and OFF) between COMMON and the PLC input onthe DL205 system?

Edit - I now see the "D2-32ND3". Sorry.

 

[latendal]

I am using the D2-32ND3 input module and i read 0V between the plc comm and plc input. I read 24.4V between either plc input and voltage source -ve terminal or plc comm and voltage source -ve terminal.

 

[bernie_carlton]

I'm assuming you are using a ZipLink terminal block. If so, which one. The LED indicator ones can be tricky.

 

[latendal]

Zl-rtb40

 

[JerryH]

Looks to me like the PLC inputs are sinking and the Robot outputs are also sinking. Not sure what the 4.8k is unless you're trying to use it as a pull-up resister.

 

[latendal]

I've even considered the possibility the transistor in my robot circuit may be fried but we have four of this robots and as you must've noticed i have quite a few of this output signals from the robot and it seems very odd to me every single one of them is fried! So i've ruled out that option!
I feel there probably is some config i've failed to either enable/disable on the robot side of things but i've gone through the robot manuals like 6 times and nothing jumps at me! It feels pretty sad to be this close and not know how to move forward!

 

[bernie_carlton]

The cable for that is the ZL-D24-CBL40

Make sure you get the right ZipLink labels for the terminals. It's not really obvious.

 

[latendal]

@Jerry Thanks!
I found this from the PLC manual which give me the notion my connection is okay

 

[latendal]

 

[latendal]

Sorry having trouble uploading pic with quick reply! Here's a link!

https://drive.google.com/file/d/0B7IRvf2V0mYBTEZIbVc5VExQQlk/edit?usp=sharing

 

[latendal]

@bernie i am using more than one of this input modules (PLC). The second is connected to servos and switches and this works fine! So my assumption is my cables should be in order!

 

[JerryH]

Sorry having trouble uploading pic with quick reply! Here's a link!

https://drive.google.com/file/d/0B7IRvf2V0mYBTEZIbVc5VExQQlk/edit?usp=sharing

I can't get to this link to see what you based your wiring on.

I still don't see how you are going to source your PLC inputs.

 

[latendal]

I can't get to this link to see what you based your wiring on.

I still don't see how you are going to source your PLC inputs.

Here's the pic!

 

[latendal]

Also i tried the sinking approach earlier on and got no results as well and it made sense to me because i was at no point supply the 24V DC required by the transistor in the output module of the robot. Here's a pic of that!